Personally, I think this topic should be banned from discussion - if and when they release I will be the first to celebrate, but I feel that this "work in progress" has been in progress for far too long.

We're freaking out over here! It is so exciting to share this news with you!

You can now Download the Black Mesa Soundtrack, courtesy of our very own Joel Nielsen, at the very generous price of whatever you want! Enjoy and share!
In the near future you'll see our Website, Wiki and Forums all taken down temporarily for renovations. On September 14th you will see the first release of Black Mesa! This will include our re-envisioning of Half-Life all the way up to Lambda Core. We believe this is a great way to provide a complete-feeling 8-10 hour experience with a solid ending, make our fans happy and help us make the best overall game possible.

We are still working hard on Xen and BMDM, but instead of making you wait we are giving you Black Mesa as soon as it's ready! We're doing our best to help bring the immense vision of this project into reality, and we are very excited for what the future brings!

Black Mesa will require the Source SDK Base 2007 to run. Many Source games purchasable through Steam come with the Shared Resources, including the SDK, that you will need in order to run Black Mesa. To see if you can run Black Mesa, open Steam and look in the tools tab. If you see an entry titled Source SDK Base 2007, you can run Black Mesa.

As of July, 2011, Valve made the Source SDK free for anyone to download.[1] This means that users who create new Steam accounts will be able to play Black Mesa without having to purchase any games. [2][3]

Please note that neither the Nvidia or ATI free game packages come with the SDK base.

If "Source SDK Base 2007" Does not appear on the tools tab in steam you must download it in order to play the mod.

I have finished HL1 twice... HL2 although like it, cannot stand the tunnels with crabs and did not finish.
The new Counterstrike Global Ops uses Source2? It looks "eatable"... Could be a big nice change for HL1....